.- Estimates average and peak indoor air concentrations of chemicals released from products or materials in houses, apartments, townhouses, or other residences. The data libraries contained in MCCEM are limited to residential settings. However, the model can be used to assess other indoor environments (e.g. schools, offices) if the user can ... supply the necessary inputs.

- Estimates inhalation exposures to these chemicals, calculated as single day doses, chronic average daily doses, or lifetime average daily doses. (All dose estimates are potential doses; they do not account for actual absorption into the body.)

How Does MCCEM Work?

- MCCEM is a user-friendly software product that estimates indoor air concentrations using a mass balance approach.

- Maintains a library of residences, containing data on zone or area volumes, interzonal air flows, and whole-house exchange rates.

- Allows you to tailor your analysis to a particular location, and to model air concentrations in as many as four zones for a given residence.

- Offers several different options for dealing with 'sinks'. A sink is a material (e.g., carpeting, wallboard) that can absorb chemicals from the air; the absorption can be either reversible or irreversible.

The program is now available for use in a Windows 95 operating environment. MCCEM has been peer reviewed by experts outside the EPA. MCCEM was developed under contract by Versar Inc. for the EPA Office of Pollution Prevention and Toxics, Economics, Exposure, and Technology Division, Exposure Assessment Branch (EAB).